Technical Information

ISO Tolerances

The tolerances shown in this table are normally applied to metric sizes of drawn, turned and ground finish bright steel bars.

Tolerances in millimetres.
The total tolerance is taken under.

Nominal Sizes (mm) h11 h10 h9 h8 h7
1 to 3 0.060 0.040 0.025 0.014 0.010
3 to 6 0.075 0.048 0.030 0.018 0.012
6 to 10 0.090 0.058 0.036 0.022 0.015
10 to 18 0.110 0.070 0.043 0.027 0.018
18 to 30 0.130 0.084 0.052 0.033 0.021
30 to 50 0.160 0.100 0.062 0.039 0.025
50 to 80 0.190 0.120 0.074 0.046 0.030
80 to 120 0.220 0.140 0.087 0.054 0.035
120 to 180 0.250 0.160 0.100 0.063 0.040

The tolerances shown in this table are normally applied to imperial sizes of drawn, turned and ground finish bright steel bars.

Tolerances in Inches.
The total tolerance is taken under.

Nominal Sizes (inch) h11 h10 h9 h8 h7
364 to 18 0.00240 0.00157 0.00098 0.00055 0.00039
18 to 1564 0.00295 0.00189 0.00118 0.00071 0.00047
1564 to 164 0.00354 0.00228 0.00142 0.00087 0.00059
2564 to 4564 0.00433 0.00275 0.00169 0.00106 0.00071
4564 to 1316 0.00511 0.00331 0.00205 0.00130 0.00082
1316 to 2 0.00629 0.00393 0.00244 0.00153 0.00098
2 to 318 0.00748 0.00474 0.00291 0.00181 0.00118
318 to 4 0.00866 0.00551 0.00342 0.00213 0.00137
4 to 7332 0.00984 0.00629 0.00393 0.00248 0.00157